This is a digital data set including historical hydrographic sounding data collected by the National Ocean Service (formerly the U.S. Coast and Geodetic Survey) within the Columbia River littoral cell (CRLC). The original data set has been edited where necessary and reprojected to Washington Stateplane, FIPS 4602, meters. Attributes inlcude easting, northing, depth-navd(m), depth-mllw(m), cartographic code, survey name, and survey year.

Purpose:

This data set is intended for use as an historical bathymetric data set for scientific research. It is not intended for navigational use. The data were originally used for bathymetric change analysis as part of the Southwest Washington Coastal Erosion Study (SWCES), a cooperative study by the US Geological Survey and the Washington State Department of Ecology.

Supplemental_Information:

The SWCES was initiated to examine coastal geology, processes, and natural hazards within the Columbia River littoral cell. The study is jointly directed by the U.S. Geological Survey Coastal and Marine Geology Program and the Washington State Department of Ecology Shorelands and Environmental Assistance Program, with active participation of local communities in Pacific and Grays Harbor counties. Related USGS work in the Southwest Washington Coastal Erosion Study can be found online at: <http://www.ecy.wa.gov/programs/sea/swce/>

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1926

Ending_Date: 1927

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -124.391894

East_Bounding_Coordinate: -124.047043

North_Bounding_Coordinate: 46.687267

South_Bounding_Coordinate: 46.145181

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: Hydrographic data

Theme_Keyword: Bathymetry

Theme_Keyword: Columbia River littoral cell

Theme_Keyword: Southwest Washington Coastal Erosion Study

Theme_Keyword: Bathymetric change

Place:

Place_Keyword_Thesaurus: none

Place_Keyword: Southwest Washington

Place_Keyword: Northern Oregon

Place_Keyword: Pacific Ocean

Place_Keyword: Pacific Northwest

Place_Keyword: Grays Harbor

Place_Keyword: Willapa Bay

Place_Keyword: Columbia River

Place_Keyword: USA

Access_Constraints: None

Use_Constraints:

Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.

This information is not intended for navigational purposes.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Please recognize the U.S. Geological Survey (USGS) and the Southwest Washington Coastal Erosion Study (SWWCES) as the source of this information.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Ann E. Gibbs

Contact_Organization: USGS

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing address

Address: 345 Middlefield Road MS999

City: Menlo Park

State_or_Province: CA

Postal_Code: 94025

Country: USA

Contact_Voice_Telephone: 650-329-5060

Contact_Electronic_Mail_Address: agibbs@usgs.gov

Data_Set_Credit:

This project is jointly funded by the Washington State Department of Ecology and the US Geological Survey, Coastal & Marine Geology Program.

The data have been cursorily evaluated for gross inaccuracies.
A discussion of errors and accuracies associated with the original
data collection methodologies can be found in Gibbs and Gelfenbaum
(1999).

Logical_Consistency_Report:

All sounding data equal to -9999 and/or with an original cartographic code not equal to 711 were eliminated from the data set. The data set was evaluated for gross inaccuracies and points that were obviously erroneous were given a cartographic code not equal to 711. Only soundings with a cartographic code should be considered useful for scientific analysis.

Completeness_Report: The data set is considered complete.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Horizontal accuracies for NOS surveys vary by water depth and distance from shore (see Gibbs and Gelfenbaum, 1999).

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Vertical accuracies for NOS surveys vary by water depth and distance from shore (see Gibbs and Gelfenbaum, 1999).

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: National Geophysical Data Center

Publication_Date: 1998

Title:

National Ocean Service Hydrographic Survey Data: US Coastal Waters

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: Data announcement 98-MGG-03.

Issue_Identification: Version 4.0.

Publication_Information:

Publication_Place: Boulder, CO

Publisher: World Data Center for Marine Geology & Geophysics,

Type_of_Source_Media: CD-ROM

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1851

Ending_Date: 1974

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: NOSHDB

Source_Contribution: All sounding data were obtained from this source.

Process_Step:

Process_Description:

Data were reprojected from geographic coordinates, NAD27 to Washington Stateplane-NAD83, FIPS 4602. All data with a sounding value of -9999 (null) and/or a NOS cartographic code not equal to 711 (sounding data) were eliminated from the data set. Data were evaluated for their relationship to overlapping surveys and given new cartographic codes where neccessary (see below for survey specific information).

Water depth relative to NAVD88 was calculated by first determining the primary tidal station used for a particular survey. This information was obtained from original smooth sheets and/or descriptive reports where possible, or assumed where such information didn't exist. Relative offsets between MLLW and NAVD88 at each tidal station was determined based on geodetic information provided for NOS benchmarks, determined by independent geodetic surveys conducted by the Department of Ecology, or estimated where no other information was available. The NAVD88 values were thus calucalated by adding the relative differences between datums to the MLLW depth values. In some cases, a larger datum correction was applied to offset obvious bias in the original data set. An in-depth description of the methodolgy employed for these conversions, along with a discussion of specific corrections, are available in Buijsman, et al., 2002.

DATA SET SPECIFIC INFORMATION:
For the data set: h4634_1927
The primary tidal station used is: Ft. Stevens, assumed
The source used to determine the tidal station: no data available
The vertical datum relative to NAVD88 is: -0.16 meters
The conversion applied to charted depths: -0.16 meters

2706 points were given a cartographic code of 888 where soundings overlapped with other surveys (H4634, H4635, H4618, H4619, H4620, and H4621) or points appeared erroneous. Some points closer to shore showed better agreement with overlapping surveys so points were left unchanged. This survey is more irregular than survey H4635 and is typically from 3-7 m deeper than H4635. H4635 seems to agree with H4611 better.

Only soundings with a cartographic code of 711 should be used for analysis.

Process_Date: Unknown

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point

Point_and_Vector_Object_Count: 9392

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point

Point_and_Vector_Object_Count: 4

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: State Plane Coordinate System 1983

State_Plane_Coordinate_System:

SPCS_Zone_Identifier: 4602

Lambert_Conformal_Conic:

Standard_Parallel: 45.833333

Standard_Parallel: 47.333333

Longitude_of_Central_Meridian: -120.500000

Latitude_of_Projection_Origin: 45.333333

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000128

Ordinate_Resolution: 0.000128

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: h4634_1927.pat

Entity_Type_Definition: unknown

Entity_Type_Definition_Source: unknown

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: unknown

Enumerated_Domain_Value_Definition: unknown

Enumerated_Domain_Value_Definition_Source: unknown

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: unknown

Enumerated_Domain_Value_Definition: unknown

Enumerated_Domain_Value_Definition_Source: unknown

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: AREA

Attribute_Definition: Area of feature in internal units squared.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: unknown

Enumerated_Domain_Value_Definition: unknown

Enumerated_Domain_Value_Definition_Source: unknown

Unrepresentable_Domain:

Area is always zero for point coverages. Values are automatically generated.

Attribute:

Attribute_Label: PERIMETER

Attribute_Definition: Perimeter of feature in internal units.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: unknown

Enumerated_Domain_Value_Definition: unknown

Enumerated_Domain_Value_Definition_Source: unknown

Unrepresentable_Domain:

Perimeter is always zero for point coverages. Values are automatically generated.